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PostgreSQL is a powerful, open source object-relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness. It runs on all major operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX, Mac OS X, Solaris, Tru64), and Windows. It is fully ACID compliant, has full support for foreign keys, joins, views, triggers, and stored procedures (in multiple languages). It includes most SQL:2008 data types, including INTEGER, NUMERIC, BOOLEAN, CHAR, VARCHAR, DATE, INTERVAL, and TIMESTAMP. It also supports storage of binary large objects, including pictures, sounds, or video. It has native programming interfaces for C/C++, Java, .Net, Perl, Python, Ruby, Tcl, ODBC, among others.

Featureful and Standards Compliant

PostgreSQL prides itself in standards compliance. Its SQL implementation
strongly conforms to the ANSI-SQL:2008 standard. It has full support for
subqueries (including subselects in the FROM clause), read-committed and
serializable transaction isolation levels. And while PostgreSQL has a fully
relational system catalog which itself supports multiple schemas per database,
its catalog is also accessible through the Information Schema as defined in the
SQL standard.

It also has a host of extensions and advanced features. Among the
conveniences are auto-increment columns through sequences, and
LIMIT/OFFSET allowing the return of partial result
sets. PostgreSQL supports compound, unique, partial, and functional indexes
which can use any of its B-tree, R-tree, hash, or GiST storage methods.

GiST
(Generalized Search Tree) indexing is an advanced system
which brings together a wide array of different sorting and searching algorithms
including B-tree, B+-tree, R-tree, partial sum trees, ranked B+-trees and many
others. It also provides an interface which allows both the creation of custom
data types as well as extensible query methods with which to search them. Thus,
GiST offers the flexibility to specify what you store,
how you store it, and the ability to define new
ways to search through it --- ways that far exceed those offered by
standard B-tree, R-tree and other generalized search algorithms.

GiST serves as a foundation for many public projects that use PostgreSQL
such as OpenFTS and PostGIS. OpenFTS (Open Source Full
Text Search engine) provides online indexing of data and relevance ranking for
database searching. PostGIS is a project which adds support for geographic
objects in PostgreSQL, allowing it to be used as a spatial database for
geographic information systems (GIS), much like ESRI's SDE or Oracle's Spatial
extension.